Shield conductor



R. HAWKSLEY SHIELD CONDUCTOR "Filed Deo, 7, 1954 2 sheets-sheet 1 Wm ,Md M ATTORNEYS Dec. 22, 1936.

R. HAWKSLEY SHIELD CONDUCTOR Filed Dec. 7, 1954 v U'UHHHXm 2Sheets-Sheet 2 INVENTOR.

@Vigil/wang# ATTORNEYS Patented Dec. 22, 1936.

UNITED STATES PATENT OFFICE SHIELD CONDUCTOR Application December 7,1934, Serial No. 756,387

10 Claims.

In certain copending applications, namely, Serial No. 723,814, filed May4, 1934 now Patent #2,033,632 dated March 10, 1936; Serial No. 736,342,led July 21, 1934 and Serial No. 736,453, liled July 23, 1934 now PatentNo. 2,033,633 dated March 10, 1936, I have disclosed improvements inhollow antennas and method of making same and also improved hollowconductor construction. The hollow conductors or antennas shown in myprior applications involve the use of telescopically engaged members forcircularly spacing a plurality of wires and method of positioning orassembling such wires. The present application is in part a continuationof my former applications and inpart an improvement thereon. In thepresent application, the claims aredirected to the combination of aconductor for transmitting high frequency currents, such for example asradio frequency currents and the circularly spaced wires serve as ashield for the conductor which is preferably located centrally of suchcircularly arranged wires.

A further feature of the invention resides in the structuralorganization of parts for supporting the radio frequency conductorrelatively to the shielding wires and to the means of anchoring orsupporting the assemblage. Other more detailed features of the inventionwill be apparent from the description when read in connection with theaccompanying drawings and will be'dened with particularity in theappended claims.

In the drawings- Fig. 1 is a perspective view of one end of a shieldedconductor embodying the invention; Fig. 2 is a similar view of theintermediate portion of the conductor; Figs. 3 and 4 are sectional viewstaken on the correspondingly numbered linesi ofl age for the shield andalso-illustrating means for f carrying thehigh frequency conductoroutside of the shielding wires; Fig. 10 is a view similar to Fig. 9, butillustrating a modification in which the high tension wire is carriedoutwardly by a branch outlet member; Fig. 11 illustrates a furthermodiiication in which the high tension conductor is passed laterallyoutward through telescopic members which space the shield wires; Fig. 12is a detail view illustrating modified means for securing the shieldwires to the anchorage member; Fig. 13 is a section on line I3-I3 ofFig. 12.

In the transmission of high voltage or high frequency currents such asused in transmitting currents of radio frequency, it is of utmostimportance to shield the radio frequency feeders and leads by means ofconductors surround-l ing such feeders which conductors are to begrounded. As more fully hereinafter described and claimed, the presentinvention contemplates the provision of a conductor for transmittingcurrents of radio frequency and a shield therefor including amultiplicity of conducting wires surrounding the conductor and means formaintaining the shielding wires in a predetermined spaced relationshipvfrom each other and from the conductor.

Referring in detail to the drawings, I0 represents the conductor whichis adapted for`transmitting high frequency currents. This conductor I0is surrounded by a multiplicity of shield wires I2 which are held inspaced relationship by telescopically engaging members I4 and I6. In theembodiment of the invention herein illustrated, the member I6 is ofdisc-like form and is notched around its periphery to form seats whichare so arranged as to maintain the predetermined required spacingbetween the adjacent conducting wires I2. The central conductor IIJ, asshown in Figs. 4 and 5, is also maintained in proper spaced relationshipwith respect to the shield wires by means of an insulating bushing I8secured in the disc I6. In a modification of Fig. 6, instead of`a disc,I employ a spider 20, the legs 22 -of which engage a number of equallyspaced shield wires I2. In this modification, the remaining shield wiresmay be assumed to be spaced at other points by a pair of telescopicallyarranged rings, such for example as shown in my prior applications abovementioned, or as shown in Fig. 10.

In the modification of Fig. 8, the central conductor I0 passes throughan insulating sleeve 24, which is positioned centrally of the circularlyarranged shield wires I2 by means of spacer wires or clips 26 havingportions 28 encircling certain determined shield wires I2. f

' It is of importance to provide means for passing the high frequencyconductor laterally between the circularly arranged shield wires. Tothese ends, I provide the improved anchoi ge members best shown in Figs.1 and 9 to 12 inclusive. The anchorage member of Figs. 1 and 9 includesan outer sleeve-like member 30 and an inner central body 32. Theextremities 34 of the shield wires I2 are rigidly secured between thesleeve 30 and central body 32. In the construction of Figs. l, 9, 10,and 11, the outer sleeve is subjected to a drawing operation so as tocompact the metal thereof about the termini of the wires and thus firmlygrip them between the sleeve 3S and the central body 32. The centralbody 32 is formed with a longitudinal chamber 3S having lateral branchopenings 38 and lll, so as to provide means whereby the high frequencyconductor l0 can be led outwardly from the space defined by thecircularly arranged shield wires l2. As will be apparent from Figs. 1and 3, the shield wires I2 converge from the spaced apart relationshipto a contacting relationship where they are secured to the anchoragefitting. Thus, the central chamber 36 with its branches provides aneffective and workman like outlet for the conductor.

Ihe terminal fitting is provided with a clevis 42 connected by a pin Ilpassing through a suitable opening in the extremity 46 of the fitting.This fitting carries a binding post 48 for connection to a wire 50 bymeans of which the shield wires are connected to ground 52. In themodification of Fig. 10, instead of passing the high frequency conductorI0 through a central chamber in the anchorage fitting, I provide aconductor supporting member 54 which has an outlet branch 56 extendinglaterally between a pair of juxtaposed shield wires. This supportingmember is flexibly connected by means of a link 58 and pins 60 with alug 62 on the end of a solid central body 64. In this Fig. 10, I haveshown the shielding wires i2 maintained in spaced relationship by a pairof coacting inner and outer rings I6 and I4.

In the modification of Fig. 1l, the high frequency conductor I0 passeslaterally outward through an opening 66 formed in a ring I 4 which maybe regarded as an equivalent of that shown in Fig. 10.

In some cases, instead of securing the interengagement of the shieldingwires l2 and the anchorage fitting by subjecting the fitting to adrawing or swaging operation, I may secure the .parts by the utilizationof a filling of readily meltable metal, such as lead, solder or thelike. This modification of the invention is illustrated in Figs. 12 and13, in which the readily meltable metal 68 may be assumed to fill thespace between the central body 64 and the sleeve portion 30. This metalmay be introduced through a suitable gate or opening 10 in thesleeve-like member 30.

While I have described quite precisely certain specific embodiments ofthe invention herein illustrated, it is to be understood that variousmodifications and substitutions of equivalents may be made and it isintended, therefore, that the following claims should be interpreted asbroadly as is consistent with the prior art.

What I claim isz- 1. In combination with a conductor for transmittingcurrent of radio frequency, a shield therefor comprising a multiplicityof wires surrounding the conductor and a pair of coacting membersbetween which the wires are clamped in a predetermined spacedrelationship, means carried by one of said members for positioning theconductor, and an anchorage fitting comprising nested telescopic memberstoward which the wires converge and between which they are secured.

2. In combination with a conductor for transmitting current of radiofrequency, a shield therefor comprising a multiplicity of circularlyspaced wires surrounding the conductor and means supported by the wiresfor positioning the conductor substantially in the center of the circledefined by said spaced wires and anchorage fitting to which the wiresare secured.

3. In combination with a conductor for transmitting current of radiofrequency, a shield therefor comprising a multiplicity of circularlyspaced wires surrounding the conductor, and means supported by the wiresfor positioning the conductor substantially in the center of the circledefined by said wires comprising telescopically related members betweenwhich wires are clamped, one of said members carrying a bushing throughwhich said conductor passes, and an anchorage fitting comprising nestedsleeves toward which the wires converge and between which they aresecured.

4. In combination with a conductor for transmitting current of radiofrequency, a shield therefor comprising a multiplicity of wiressurrounding the conductor and a pair of nested members of relativelylarge diameter engaging the wires and maintaining them in apredetermined spaced relationship from each other, means carried by oneof said members for positioning the conductor, an anchorage fittingincluding an outer sleeve and an inner body engaging the ends of thewires, said body having a passage therein through which the conductorextends said sleeve and body being of relatively small diameter ascompared with the aforesaid nested members.

5. In combination with a conductor for transmitting current of radiofrequency, a shield therefor comprising a multiplicity of wiressurrounding the conductor and means for maintaining the wires inpredetermined spaced relationship from each other and from the conductorand an anchorage fitting toward which the wires converge and to whichthey are secured, said anchorage fitting having therein a longitudinallyextending chamber with lateral branch openings through which saidconductor passes from the interior to the exterior of the shield formedby said wires.

6. In combination with a conductor for transmitting current of radiofrequency, a shield therefor comprising a multiplicity of circularlyspaced wires surrounding the conductor and means for positioning thelatter substantially in the center of the circle defined by said spacedwires and an anchorage fitting including a sleeve portion and a centralbody between which the extremities of said wires are flxedly secured incircular juxtaposition,

'l. In combination with a conductor for transmitting current of radiofrequency, a shield therefor comprising a multiplicity of circularlyspaced wires surrounding the conductor and means for positioning thelatter substantially in the center of the circle defined by said spacedwires and an anchorage fitting including a sleeve portion and a centralbody between which the extremities of said wires are flxedly secured incircular juxtaposition by a body of readily meltable metal.

8. In combination with a conductor for trans- -mitting current of radiofrequency, a shield therefor comprising a multiplicity of circularlyspaced wires surrounding the conductor and means for positioning thelatter substantially in the center of the circle defined by said spacedwires and an anchorage tting including a sleeve portion and a centralbody between which the extremities of said wires are flxedly secured incircular juxtaposition, said sleeve portion being forcibly constrictedabout the extremities of the wires and the central body.

9. In combination with a conductor for transmitting current of radiofrequency, a shield therefor comprising a multiplicity of circularlyspaced wires surrounding the conductor and means for positioning thelatter substantially in the center of the circle defined by said spacedwires and an anchorage tting including a sleeve portion and a centralbody between which the extremities of said wires are xedLy securedincircular juxtaposition and supporting means for the conductor secured tosaid body.

10. In combination with a conductor for transmitting current o1' radiofrequency, a shield therefor comprising a multiplicity of circularlyspaced wires surrounding the conductor and means for positioning thelatter substantially in the center of the circle deiined by said spacedwires and an anchorage tting including a sleeve portion and a centralbody between which the extremities of said wires are xedly secured incircular juxtaposition and an outlet member, having a central partflexibly connected with said central body and branch extending laterallybetween two adjacent wires and through which said conductor passes.

RAY HAWKSLEY.

